Football-shaped slipper



FIG. 1 is a perspective view of a football-shaped slipper embodying my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof, the other side view being mirror image thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken line showing of the slipper bottom in the Figures is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a football-shaped slipper, as shown and described. 